Construction for holding recording paper roll

Abstract

In a holding construction for holding a recording paper rolled up around a cylindrical base, by inserting a holding member into each end of the base and supporting the holding member with a supporting member, either projections or recesses are formed on the outer circumferential surface of at least one of the holding members at predetermined pitches in the circumferential direction, and either recesses to be engaged with said projections or projections to be engaged with said recesses are formed in the portion of the supporting member which abuts against the outer circumferential surface of the holding member, at pitches determined on the basis of said predetermined pitches.

What is claimed is: 
     
       1. A holding construction for holding a recording paper rolled up around a cylindrical base, by inserting a holding member into each end of the base and supporting the holding member with a supporting member, comprising: at least one of the holding members including a flange portion which has an outer circumferential surface with projections and recesses formed in predetermined pitches in the circumferential direction in the outer circumferential surface of the flange, the pitch between at least two adjacent projections having a first value and   recesses and projections formed in a portion of the supporting member for abutting against the outer circumferential surface of the flange portion at pitches determined on the basis of said predetermined pitches,   the pitch between at least two adjacent protections having a second value which is different than said first value so that the recesses and projections of the supporting member engage the projections or recesses respectively of the flange portion.   
     
     
       2. The holding construction of claim 1, wherein the recesses are formed so that at least one recess exists between any two adjacent projections upon physical contact engagement, and the pitch of the projections is equal to an integral multiple of the pitch of the recesses. 
     
     
       3. The holding construction of claim 2, wherein the holding member comprises a first shaft portion which is inserted into the base, a second shaft portion which is connected to the first shaft portion and which abuts against the supporting member, and the flange portion is formed extending radially and outwardly from a joint portion between the first shaft portion and the second shaft portion and which abuts against end faces of the base and rolled-up recording paper. 
     
     
       4. The holding construction of claim 1, wherein the holding member comprises a first shaft portion which is inserted into the base, a second shaft portion which is connected to the first shaft portion and which abuts against the supporting member, and the flange portion is formed extending radially and outwardly from a joint portion between the first shaft portion and the second shaft portion and which abuts against end faces of the base and rolled-up recording paper.